"We are certainly looking into all aspects of the information that comes forward,” Soto added.

"I want to make a point that we are going through a lot of video."

Witnesses at the protest said the two men in the pick-up had been spotted lurking near the protest.

Reno Mayor Hillary Schieve said in a statement yesterday: "Public safety is our highest priority and I want all Reno residents to know that we are working swiftly and diligently to make sense of the events that took place last night.

"The Reno Police Department will hold anyone responsible accountable for their actions once the investigation has concluded.